[Abagail]

Something like this?

pawn Код:

stock GetPlayerFirstName(playerid)
{
    new NickName[MAX_PLAYER_NAME];
    GetPlayerName(playerid, NickName, MAX_PLAYER_NAME);
    strdel(NickName, strfind(NickName, "_"), strlen(NickName));
    return NickName;
}

or

pawn Код:

sscanf(PlayerName,"s[24]'_'{s[24]}",FirstName);

Credits go to this thread: https://sampforum.blast.hk/showthread.php?tid=328590
A search would've gave you an answer pretty fast(******.com).